硅胶负载F掺杂TiO_2的制备与性能评价

利用水热法,以硅胶为载体、以Ti（SO4）2为钛源、NaF为氟源制备了具有良好性能的＂硅胶负载氟掺杂二氧化钛＂（FTS）光催化剂。考察了氟投加量、焙烧温度及钛硅比对光催化活性的影响。利用X射线晶体粉末衍射（XRD）,比表面积分析（BET）和紫外可见漫反射光谱（DRS）等表征手段对样品进行表征。结果表明,氟投加量为30%、钛硅比为1/1、焙烧温度为200℃时制备的FTS具有最佳的光催化活性,其比表面积为81.40 m2/g。氟掺杂二氧化钛（FT）经硅胶负载后,其表面孔结构发生了变化,并且热稳定性增加。苯酚降解实验表明：与FT相比,FTS以0.53 g/g的二氧化钛含量却体现更高光催化活性。

Preparation and Performance Evaluation of Fluorine Doped Titanium Dioxide Supported on SiO2

A fluorine doped titanium dioxide photocatalyst,supported on SiO2,was synthesized by hydrothermal process taking silica gel as carrier,Ti(SO4)2 as Ti source and NaF as F source.The as-prepared samples were characterized by X-ray diffraction,Brunauer-Emmett-Teller surface area and UV-vis diffuse reflectance spectra.Such factors as the doping proportion of fluorine and titanium,the calcinations temperature and the proportion of titanium and silicon,which influenced the photocatalytic activity of sample were discussed in detail.The experiment indicated that its best fluorine titanium ratio was 30%,the best calcination temperature was 200 ℃,and the ratio of titanium and silicon was 1/1.BET surface area of FTS was 80.4 m2/g.Silica influenced the structural and textural properties of FT.Phenol degradation test showed that the photocatalytic activity of FTS was better than that of FT,although the TiO2 concentration of FTS was 0.53 g/g,which was less than that of FT.